<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
    var a= 1,b= 2,c=3;
   /* var d=a++;
    console.log(d);
    var e=++b;
    console.log(e);*/
    var f=(c++)+c;
    console.log(f);
</script>
</body>
</html>